There is provided an electronic paper display device, and a method of manufacturing the same. The electronic paper display device includes a display side electrode formed of a transparent material, a rear electrode opposing the display side electrode, a substrate disposed between the display side electrode and the rear electrode, and including a plurality of partition walls separating a space between the display side electrode and the rear electrode and a plurality of cell spaces formed by the plurality of partition walls, and two or more types of rotary bodies disposed in the plurality of cell spaces and displaying different respective colors. The same type of rotary bodies displaying the same color among the rotary bodies includes a plurality of rotary bodies having different respective shades. The electronic paper display device has high image stability and uniformity and enables the expression of various shades.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An electronic paper display device comprising: a display side electrode formed of a transparent material; a rear electrode opposing the display side electrode; a substrate disposed between the display side electrode and the rear electrode, and including a plurality of partition walls separating a space between the display side electrode and the rear electrode, and a plurality of cell spaces formed by the plurality of partition walls; and two or more types of rotary bodies disposed in the plurality of cell spaces and displaying different respective colors, wherein the rotary bodies each have a first display region colored white or black and a second display region colored red, green or blue, and the same type of rotary bodies, which display a common color, among the two or more types of rotary bodies, include commonly colored second display regions having different respective shades.
2. The electronic paper display device of claim 1 , wherein the rotary bodies include three types of rotary bodies respectively displaying red, green and blue.
3. The electronic paper display device of claim 1 , wherein the first and second display regions having different electrical charge properties.
4. The electronic paper display device of claim 1 , wherein the same type of rotary bodies include three rotary bodies having a relative shade ratio of 4:2:1.
5. The electronic paper display device of claim 1 , wherein the rotary bodies each have a spherical, oval or cylindrical shape.
6. A method of manufacturing an electronic paper display device, the method comprising: preparing a substrate including a plurality of partition walls and a plurality of cell spaces formed by the plurality of partition walls; disposing two or more types of rotary bodies displaying different respective colors in the plurality of cell spaces, wherein the rotary bodies each have a first display region colored white or black and a second display region colored red, green or blue, and the same type of rotary bodies, which display a common color, among the two or more types of rotary bodies, include commonly colored second display regions having different respective shades; forming a display side electrode on the substrate to cover the rotary bodies; and forming a rear electrode on the substrate such that the rear electrode opposes the display side electrode.
7. The method of claim 6 , wherein the substrate is formed by an imprinting process, a laser patterning process, a photolithography process or an etching process.
8. The method of claim 6 , wherein the disposing of the two or more types of rotary bodies includes: disposing a mask or a filter, exposing the cell spaces, on the substrate; and injecting the rotary bodies by using a squeegee.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 10, 2010
November 13, 2012
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